// Write buf's contents to disk. Must be locked.
void
bwrite(struct buf *b)
{
if((b->flags & B_BUSY) == 0)
panic("bwrite");
b->flags |= B_DIRTY;
ide_rw(b);
}
long XHReadWrite(UWORD major, UWORD minor, UWORD rw, ULONG sector,
UWORD count, void *buf)
{
WORD dev = major;
#if DBG_XHDI
kprintf("XH%s(device=%d.%d, sector=%ld, count=%d, buf=%p)\n",
rw ? "Write" : "Read", major, minor, sector, count, buf);
#endif
#if CONF_WITH_XHDI
if (next_handler) {
long ret = next_handler(XHREADWRITE, major, minor, rw, sector, count, buf);
if (ret != EINVFN && ret != EUNDEV)
return ret;
}
#endif
#if DETECT_NATIVE_FEATURES
/* direct access to device */
if (get_xhdi_nfid()) {
long ret = NFCall(get_xhdi_nfid() + XHREADWRITE, (long)dev, (long)0, (long)rw, (long)sector, (long)count, buf);
if (ret != EINVFN && ret != EUNDEV)
return ret;
}
#endif
if (minor != 0)
return EUNDEV;
/* hardware access to device */
if (FALSE) {
/* Dummy case for conditional compilation */
}
#if CONF_WITH_ACSI
else if (dev >= 0 && dev < 8) {
long ret = acsi_rw(rw, sector, count, (LONG)buf, dev);
#if DBG_XHDI
kprintf("acsi_rw() returned %ld\n", ret);
#endif
return ret;
}
#endif /* CONF_WITH_ACSI */
else if (dev < 16) {
return EUNDEV; /* call scsi_rw() here when implemented */
}
#if CONF_WITH_IDE
else if (dev < 24) {
long ret = ide_rw(rw, sector, count, (LONG)buf, dev - 16);
#if DBG_XHDI
kprintf("ide_rw() returned %ld\n", ret);
#endif
return ret;
}
#endif /* CONF_WITH_IDE */
return EUNDEV; /* unknown device */
}
// Return a B_BUSY buf with the contents of the indicated disk sector.
struct buf*
bread(uint dev, uint sector)
{
struct buf *b;
b = bget(dev, sector);
if(!(b->flags & B_VALID))
ide_rw(b);
return b;
}